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Username Post: '08 Trailblazer brakes locked up        (Topic#366702)
8683jb 
Contributor
Posts: 104

Reg: 09-06-13
10-14-21 08:21 PM - Post#2829186    

This evening I started my '08 Trailblazer, released the parking brake, put it gear and the brakes were locked up. I thought maybe the parking brake didn't release so I cycled it a couple of times, but no change - locked up tight as could be. I shut the engine off and re-started it and the brakes were released and the rest of the drive was normal. It's never happened before and I sure want to fix it before it happens again and then doesn't release. What kind of electronic nonsense causes that? Thanks for any help.



 




paulo57509 
Senior Member
Posts: 536

Loc: CA
Reg: 07-18-00
10-15-21 05:07 PM - Post#2829226    
    In response to 8683jb

The parking brake is not electronic.

I wouldn't worry about it until it happens again so you can further diagnose to determine if it's the parking brake or service brake.

1987 IROC-Z 5.0L
1992 Lumina Euro 3.1L
2003 GMC Safari


 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25593
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
10-15-21 05:52 PM - Post#2829231    
    In response to paulo57509

It’s aged. I would remove the rear disc or drums. Use brake cleaner on springs and moving parts.
Do you live where they salt roads?

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 
8683jb 
Contributor
Posts: 104

Reg: 09-06-13
10-15-21 07:57 PM - Post#2829238    
    In response to gchemist

I'm hopefully gonna fix it before it happens again - some of the places I drive, I don't want to be broke down in. Negative on the salt roads. My guess is that it's something electronic and not rusty or mechanical. When they were stuck, it was just like holding the brake pedal down hard and stepping on the gas - not even the slightest chance it was gonna move. Turning the ignition off and then back on released them immediately. What do you think?



 
SleeperSS 
Senior Member
Posts: 2640

Loc: Spanaway, Wa
Reg: 10-17-04
10-16-21 07:18 AM - Post#2829248    
    In response to 8683jb

They're not electric. They use the same style e-brakes as the disc equipped S10 Blazers. I'd check the cables for rust or corrosion. They're not the most reliable e-brakes on the planet.

U.S.C.G. "So others may live"

'96 S-10 SS
'02 BlaZeR2





 
8683jb 
Contributor
Posts: 104

Reg: 09-06-13
10-16-21 07:56 AM - Post#2829251    
    In response to SleeperSS

I know the parking brake is mechanical and I'm sure that wasn't the problem. I only mentioned it because it was my first thought when the car wouldn't move. With it released, the service brakes were still locked up. It sounds like an electronic issue of some sort when turning the ignition off and back on again released them.



 
paulo57509 
Senior Member
Posts: 536

Loc: CA
Reg: 07-18-00
10-16-21 03:15 PM - Post#2829279    
    In response to 8683jb

  • 8683jb Said:
I know the parking brake is mechanical and I'm sure that wasn't the problem. I only mentioned it because it was my first thought when the car wouldn't move. With it released, the service brakes were still locked up. It sounds like an electronic issue of some sort when turning the ignition off and back on again released them.



IF you are sure it isn't the parking brake you need to ask yourself, what electrical controls are connected to the service brakes?

I doubt it's the ABS as that system only works to release the brakes.

Does your vehicle have some kind of stability or skid control? Or active collision (not just a stupid warning light on the dash) that electrically applies the brakes? It would have to keep them applied with the key OFF which seems unlikely to me.

Question: You mentioned in your original post that you, "put it in gear"....what gear did you put it in?


1987 IROC-Z 5.0L
1992 Lumina Euro 3.1L
2003 GMC Safari


Edited by paulo57509 on 10-16-21 03:33 PM. Reason for edit: Added "Question"

 
8683jb 
Contributor
Posts: 104

Reg: 09-06-13
10-16-21 03:40 PM - Post#2829284    
    In response to paulo57509

I can say pretty confidently that it wasn't the parking brake because earlier I set the parking brake to where I normally set it, stepped on the gas and it wasn't too long before it started to overcome the parking brake enough to move the vehicle some. When the incident happened the other night, the brakes were locked solid and nothing was gonna move it until I turned the key off & back on. The car does have Stabilitrak, if that might be a problem, and as far as other electrical components that might be tied to the brakes, it beats the heck outta me. I don't parleyvoo any of the electronic stuff at all. Shoot, my cell phone is an old rope-start model, and I can barely keep up with it! I was hoping someone on here might've had a similar experience and would know which way to go to wring it out. I appreciate your guys' input.



 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25593
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
10-16-21 04:45 PM - Post#2829298    
    In response to 8683jb

Start looking at front caliper operation. I’ve had a few lock up on different vehicles. Some so bad, rotors burned up. Look at rotors and pads. Is one side worn down over the other? Lube the slide pins. Check the power booster line. It could be holding vacuum.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE


 




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